15,023 questions
-2
votes
0
answers
99
views
Why can't standard functions and methods work with structure in C++? [duplicate]
Overview
Problem
I have a struct ShipCell, a lot of these structures are stored in the Ships class. In this class, I have defined the removeDuplicates() method, which throws an error.
removeDuplicates(...
-6
votes
0
answers
95
views
How does an immutable iterator keep track of its state in Python? [closed]
I can create an "immutable" iterator object with the below code:
@dataclass(frozen=True)
class MyIterator1:
def __iter__(self):
return self
def __next__(self):
choice ...
- 41
2
votes
1
answer
86
views
OpenMP in C | How to keep private iterable after loop
So i'm working on some homework related to fixing som buggy code when i ran into an interesting problem. I don't think it was one of the indended bugs because the lecturer was confused by it as well. ...
3
votes
2
answers
111
views
Iterate over elements, not references on them
I am trying to implement a display driver wrapper in (no_std) Rust, that is responsible to write an sequence of pixels into a frame buffer. The pixel data is coming from the C world, and representing ...
- 31
0
votes
0
answers
37
views
How do I use str::split and str::split_whitespace in the arms of a match expression in Rust [duplicate]
I have some code that splits a string and then does some processing on each part of the string, before returning Vec of values based on each segment. By default, the code should split the string by ...
- 1,220
0
votes
0
answers
55
views
Dereference iterator and then iterate over dereferenced value [duplicate]
I have a piece of text with delimiters in it. I need to extract words from it and convert them to lower case. My approach is to use regular expressions to split the text and use transform to convert ...
- 4,688
1
vote
1
answer
74
views
Shallow copying enumeration iterator behavior in Python
I am trying to understand the behavior of iterators in Python, particularly when using the copy.copy() and copy.deepcopy() functions. I have the following script:
import copy
my_list = ["a",...
- 11
-5
votes
1
answer
133
views
calling a class object in an iterative way on python
I made the next class
obj = MyClass()
fds=['a','b','c']
for i in fds:
attribute_name = f"{i}"
setattr(obj, attribute_name, [f"{i}"])
print(obj.i)
I know that obj.i is ...
4
votes
2
answers
213
views
Can the back() iterator of a vector be safely assumed to be the end() iterator after a pop_back()?
My problem is the following :
std::vector<struct pollfd> vec = { ... }; // Actually a member variable on a Server object
for (auto iter = vec.begin(); iter != vec.end(); ) {
if (...
- 151
2
votes
1
answer
88
views
How to return an empty **peekable** iterator in Rust?
I have the following Rust function
fn query_list_or_empty<'a, P, R>(
conn: &'a mut SimpleConnection,
sql: &'a str,
params: P,
) -> Peekable<Box<dyn Iterator<Item =...
- 91
1
vote
1
answer
129
views
Why does passing a Map.entries() iterator as child to a Collaspsible from shadcn render nothing unless I wrap it with Array.from()?
I’m using shadcn/ui with Radix UI’s Collapsible to make a collapsible filter section.
Wrapper component:
import { ReactNode, useEffect, useState } from "react";
import { Collapsible, ...
- 71
1
vote
1
answer
128
views
Is there a Rust way to `continue` a loop inside a `map` closure?
I found this question here but that one doesn't really answer my question due to it having an answer centered around unwrap_or_else.
Here is the code I am trying to use, simplified:
let x = loop {
...
- 103
4
votes
2
answers
172
views
Why is `iterator_category` deleted in `std::views::concat::iterator` if it's a pure input iterator?
In the C++26-adopted proposal p2542, i.e. std::views::concat, there is a confusing statement:
The member typedef-name iterator_category is defined if and only if all-forward<Const, Views...> is ...
- 44.5k
3
votes
1
answer
137
views
Can't resume using the Iterator helper object
✔ 1. This, with iterator object, works:
let m = n => n * 2;
let it1 = [1, 2, 3].values ();
let [a1] = it1.map (m),
[...b1] = it1.map (m);
console.log (a1 + '', b1 + ''); // '2', '4,6'
✘ 2. ...
- 5,371
0
votes
3
answers
206
views
Confusion about invalidated iterators
If vectors are stored contiguously, as long as they are not made smaller or reallocated, any iterator pointing to an element within it should be valid. The following code would be defined:
#include &...
- 119